add core/float/to_s spec (sadly most expectations are failing due to a precision loss - to investigate)

test/test-android/app/core/float/to_s_spec.rb

@@ -0,0 +1,77 @@
+describe "Float#to_s" do
+  it "returns 'NaN' for NaN" do
+    nan_value().to_s.should == 'NaN'
+  end
+
+  it "returns 'Infinity' for positive infinity" do
+    infinity_value().to_s.should == 'Infinity'
+  end
+
+  it "returns '-Infinity' for negative infinity" do
+    (-infinity_value()).to_s.should == '-Infinity'
+  end
+
+  it "returns '0.0' for 0.0" do
+    0.0.to_s.should == "0.0"
+  end
+
+  it "emits '-' for -0.0" do
+    -0.0.to_s.should == "-0.0"
+  end
+
+  it "emits a '-' for negative values" do
+    -3.14.to_s.should == "-3.14"
+  end
+
+  it "emits a trailing '.0' for a whole number" do
+    50.0.to_s.should == "50.0"
+  end
+
+  it "emits a trailing '.0' for the mantissa in e format" do
+    1.0e20.to_s.should == "1.0e+20"
+  end
+
+  it "uses non-e format for a positive value with fractional part having 4 decimal places" do
+    0.0001.to_s.should == "0.0001"
+  end
+
+  it "uses non-e format for a negative value with fractional part having 4 decimal places" do
+    -0.0001.to_s.should == "-0.0001"
+  end
+
+  it "uses e format for a positive value with fractional part having 5 decimal places" do
+    0.00001.to_s.should == "1.0e-05"
+  end
+
+  it "uses e format for a negative value with fractional part having 5 decimal places" do
+    -0.00001.to_s.should == "-1.0e-05"
+  end
+
+  it "uses non-e format for a positive value with whole part having 14 decimal places" do
+    10000000000000.0.to_s.should == "10000000000000.0"
+  end
+
+  it "uses non-e format for a negative value with whole part having 14 decimal places" do
+    -10000000000000.0.to_s.should == "-10000000000000.0"
+  end
+
+  it "uses non-e format for a positive value with whole part having 16 decimal places" do
+    1000000000000000.0.to_s.should == "1000000000000000.0"
+  end
+
+  it "uses non-e format for a negative value with whole part having 15 decimal places" do
+    -1000000000000000.0.to_s.should == "-1000000000000000.0"
+  end
+
+  it "uses e format for a positive value with whole part having 16 decimal places" do
+    10000000000000000.0.to_s.should == "1.0e+16"
+  end
+
+  it "uses e format for a negative value with whole part having 16 decimal places" do
+    -10000000000000000.0.to_s.should == "-1.0e+16"
+  end
+
+  it "outputs the minimal, unique form to represent the value" do
+    0.56.to_s.should == "0.56"
+  end
+end